Because for people whose rigs run 24x7, there's no such thing as too much RAM. Eventually, Windows caches everything it reads from the disk onto the memory (memory caching), until an application needs its space. So with say 48 GB of memory, you're practically running Windows, a couple of your favourite applications, and one or two big games completely off your RAM.

unles ur going to use ramdisk,or ramcache i have no clue why u want so much memory instaled!!
i think 16gb i waaay more then enough!!!
what ur rich or something ??u dont know how to spend ur money??

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The Xeons that support 48GB are workstation and server processors. If you don't know why you need that much memory in those situations you should be on a tech website posting about why you would need that much memory.

Also, if you run virtual machines they eat up memory very quickly. The server I just built for a local school that they are using to run virtual machines on for the students to practice setting up servers on runs 64GB of RAM, and provides 48 virtual servers each dedicated 1.25GB of RAM, so it sits at 60GB of uses memory at all times.

Or virtual machines, or a server or, running many heavy apps altogether or heavy professional video editing, there are many more reasons besides that.
I would like to have that RAM I hate disk thrashing

The Xeons that support 48GB are workstation and server processors. If you don't know why you need that much memory in those situations you should be on a tech website posting about why you would need that much memory.

Also, if you run virtual machines they eat up memory very quickly. The server I just built for a local school that they are using to run virtual machines on for the students to practice setting up servers on runs 64GB of RAM, and provides 48 virtual servers each dedicated 1.25GB of RAM, so it sits at 60GB of uses memory at all times.

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look.. for all u arguing!!...the guy didnt mention any server or havy duty apps!! i know that profesional video and graphic editing need much ram!! i gues that is why intel maye extreme cpu...with quad chanel!!all i say for normal user u could spend money on other piece of hardware...,but then again..,he did mention in reply that money aint prob to him so of u chill out!!peace..

look.. for all u arguing!!...the guy didnt mention any server or havy duty apps!! i know that profesional video and graphic editing need much ram!! i gues that is why intel maye extreme cpu...with quad chanel!!all i say for normal user u could spend money on other piece of hardware...,but then again..,he did mention in reply that money aint prob to him so of u chill out!!peace..

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We aren't arguing, we are telling you what usage situations would need large amounts of RAM. He didn't saying anything about his usage, so that is why assuming he doesn't need that amount of RAM is just as bad as assuming he does. We aren't assuming he does need that amount of RAM, we are just saying what it could be used for, you are assuming he doesn't need that amount of RAM. I say leave it up to him to decide that for himself.

We aren't arguing, we are telling you what usage situations would need large amounts of RAM. He didn't saying anything about his usage, so that is why assuming he doesn't need that amount of RAM is just as bad as assuming he does. We aren't assuming he does need that amount of RAM, we are just saying what it could be used for, you are assuming he doesn't need that amount of RAM. I say leave it up to him to decide that for himself.

Because for people whose rigs run 24x7, there's no such thing as too much RAM. Eventually, Windows caches everything it reads from the disk onto the memory (memory caching), until an application needs its space. So with say 48 GB of memory, you're practically running Windows, a couple of your favourite applications, and one or two big games completely off your RAM.